Feature request: only change file modified metadata on changed files

[moderation]

When I run sd 0.146.0 0.147.0 *.*s in a directory, all files that match *.*s have their modified metadata to the time of the command execution, including files that don't have the desired string

Can sd be modified to only change the metadata for files that are actually changed?

[nc7s]

Replacer::replacen() currently returns a Cow::Borrowed if there is no capture. We can match on that, or we can return a Option<Cow::Owned> being None on no capture.